• Support PF! Buy your school textbooks, materials and every day products Here!

Can someone help with this problem

  • Thread starter Jumpy Lee
  • Start date
20
0
1. Homework Statement

Find the derivitive of y = (e^cx)(c sin x – cos x)

2. Homework Equations

None

3. The Attempt at a Solution

c(e^cx)(c sin x – cos x) + (c cos x + sin x)(e^cx)

The answer is { (1+c^2)((e^cx)sin x)
 

Answers and Replies

TD
Homework Helper
1,020
0
3. The Attempt at a Solution

c(e^cx)(c sin x – cos x) + (c cos x + sin x)(e^cx)

The answer is { (1+c^2)((e^cx)sin x)
You're doing fine, they are the same! Try to simplify :smile:
 
72
0
it is right .... hey TD ..what he should simplify
 
TD
Homework Helper
1,020
0
If you look well, you see the terms in cos(x) are opposite, they cancel out.
 
72
0
ah ok he did it .... i thought there is somethin' else i missed thanks for the reply
 
20
0
Thanks TD i see how it works now :smile:
 
TD
Homework Helper
1,020
0
You're welcome!

When you see that the given answer doesn't match your "longer" answer, always think of simplifying, it may just be correct after all :smile: !
 

Related Threads for: Can someone help with this problem

Replies
15
Views
1K
  • Last Post
Replies
1
Views
2K
Replies
1
Views
2K
Replies
9
Views
3K
Replies
4
Views
970
  • Last Post
Replies
4
Views
2K
Replies
4
Views
2K
Top